How to generate a blue video screen?

[DrWhoF]

bue at90s2313

I need to generate blue video screen.
When something goes wrong with a video camera this signal will be fed to the security system.
I know how to generate black&white video signal with 8051 and D/A R-ladder.
Can similar concept be used to generate color video signal?
DrWho

 

[nandhu015]

90s2313 pal

Yes ofcourse

But i think you need a faster controller

there are projects to generate patterns and colours in tv using AVR

best of luck

Nandhu

 

[IanP]

Re: Blue screen

You can go 'back' to project that you have started with: AT90S2313-based PAL bar generator ..
https://www.serasidis.gr/circuits/colour_bar_gen/colour_bar_gen.htm
They 'overclocked' the AT90S2323-10 MCU with 17(something)MHz crystal and were able to produce some colour bars ..

Regards,
IanP

 

[rachid77]

Re: Blue screen

hello
you can use the geratore of signe.
regards.

 

[DrWhoF]

Re: Blue screen

I am not familiar with 89S2313 and I don' have 89S2313 assembler and programmer. That is the problem.
DrWho

 

[IanP]

Re: Blue screen

AVR Studio Version 4 includes AT90S2313 assembler and is free from Atmel web site ..
You can downloaded it from:
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2725

As far as programmer is concerned, the AT89S2313 can be programmed by the same ISP programmer as the AT89S51/2/3 ..
**broken link removed**
(software included) ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

Yeah, I already have ISPPGM programmer and I know the 90S2313 option is there but I am not sure how to use it.
DrWho

 

[IanP]

Re: Blue screen

Make an adaptor that accomodates the AT90S2313 and fits into 40-pin AT89S52 socket .. see attached picture ..
Required connections are as follows:
RST, SCK, MOSI, MISO, XTAL1, XTAL2, GND and +5V ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

Picture is out of focus but I understand what you mean.Good idea.

I downloaded AVR studio and tried to generate hex file but got some warnings and errors:

C:\~colour_bar.asm(43) : warning: Register r26 already defined by the .DEF directive
C:\~\colour_bar.asm(44 ): warning: Register r27 already defined by the .DEF directive
C:\~\colour_bar.asm(45 ): warning: Register r30 already defined by the .DEF directive
C:\~\colour_bar.asm(46 ): warning: Register r28 already defined by the .DEF directive
C:\~\colour_bar.asm(30 8): error: Illegal use of register 'delay' as label
C:\~\colour_bar.asm(38 ): info: previous definition of 'delay'

Assembly failed, 1 errors, 4 warnings

As I said I am not familiar with AT90S2313 so I am stuck with this.
HELP :!::!::!:
DrWho

 

[IanP]

Re: Blue screen

Which source code file did you try to compile?

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

Sorry, here it is.
colour_bar_gen.asm

 

[IanP]

Re: Blue screen

Don't worry about warnings .. they just re-named registers, that's all ..

Also, they used the same name for label and variable - "delay" ..
So, to eliminate error goto -Delay- and change from -delay:- to delay1: ..
Then, in -Start2:- and in the end of -color_burst:- replace *rcall delay* with *rcall delay1* ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

Yeah, it is working now. Thanks.
Before I go any further with software modifications I have to build adaptor and buy some 90S2313.
I'LL BE BACK
DrWho

 

[DrWhoF]

Re: Blue screen

O.K.
I have two 90S2313 but when I connect my adaptor to 89S52 ISP programmer and run ISP software it says something about wrong signature ?!?!?!
What's that?

 

[IanP]

Re: Blue screen

This may mean that your programmer is not connected, your adaptor is wrongly wired or that the PC can not synchronize with the AT90S2313 ..
First, double-check connections and make sure that all pins required for read/write operations are correctly wired ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

What do you mean by "can not synchronize"?
90S2313 usesthe same 4MHz crystal from 89S52 progammer and I don't have problems with 89S52.
DrWho

 

[IanP]

Re: Blue screen

Assuming that your 89S52 programmer is from here:
**broken link removed**
and your AT90S2313 adaptor is wired correctly, run the ISP software, click on READ and for a short period of time (attempt to establish communication) you should "see" oscillations (≈2.5Vpp) on pins XTAL1 and XTAL2 ..
Can you confirm the above ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

Well, I can see something that looks like 50mV sine-wave but it is not 2.5Vpp.

 

[IanP]

Re: Blue screen

Do you have load caps on pins XTAL1 and XTAL2 as shown on the attached picture ..

Regards,
IanP

 

[DrWhoF]

Re: Blue screen

I have none.
ISP progammer uses only 4MHz crystal and it is working fine with 89S52.